FResizableRegionData constructor

FResizableRegionData({
  1. required int index,
  2. required ({double max, double min, double total}) extent,
  3. required ({double max, double min}) offset,
})

Creates a FResizableRegionData.

Implementation

FResizableRegionData({
  required this.index,
  required ({double min, double max, double total}) extent,
  required this.offset,
})  : assert(0 <= index, 'Index should be non-negative, but is $index.'),
      assert(0 < extent.min, 'Min extent should be positive, but is ${extent.min}'),
      assert(
        extent.min < extent.max,
        'Min extent should be less than the max extent, but min is ${extent.min} and max is ${extent.max}',
      ),
      assert(
        extent.max <= extent.total,
        'Max extent should be less than or equal to the total extent, but max is ${extent.max} and total is ${extent.total}',
      ),
      assert(0 <= offset.min, 'Min offset should be non-negative, but is ${offset.min}'),
      assert(
        offset.min < offset.max,
        'Min offset should be less than the max offset, but min is ${offset.min} and max is ${offset.max}',
      ),
      assert(
        0 <= offset.max - offset.min && offset.max - offset.min <= extent.max,
        'Current extent should be non-negative and less than or equal to the max extent, but current is '
        '${offset.max - offset.min} and max is ${extent.max}.',
      ),
      extent = (min: extent.min, current: offset.max - offset.min, max: extent.max, total: extent.total);